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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
Assets    
Cash and cash equivalents $ 35,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 54,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, less allowance for doubtful accounts of $14 and $0 877,000us-gaap_AccountsReceivableNetCurrent 1,285,000us-gaap_AccountsReceivableNetCurrent
Accounts receivable-related party, less allowance for doubtful accounts of $159 and $257   168,000us-gaap_DueFromRelatedPartiesCurrent
Inventory 804,000us-gaap_InventoryNet 1,253,000us-gaap_InventoryNet
Deferred tax asset-current 68,000us-gaap_DeferredTaxAssetsNetCurrent 130,000us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 311,000us-gaap_OtherAssetsCurrent 312,000us-gaap_OtherAssetsCurrent
Total current assets 2,095,000us-gaap_AssetsCurrent 3,202,000us-gaap_AssetsCurrent
Restricted cash 386,000us-gaap_RestrictedCashAndInvestmentsNoncurrent 507,000us-gaap_RestrictedCashAndInvestmentsNoncurrent
Loan fees, net 18,000us-gaap_DeferredFinanceCostsNoncurrentNet 35,000us-gaap_DeferredFinanceCostsNoncurrentNet
Oil and gas properties, net (full cost accounting method) 25,413,000us-gaap_OilAndGasPropertyFullCostMethodNet 24,123,000us-gaap_OilAndGasPropertyFullCostMethodNet
Manufactured Methane facilities, net 1,634,000tgc_MethaneProjectNet 4,389,000tgc_MethaneProjectNet
Other property and equipment, net 200,000us-gaap_PropertyPlantAndEquipmentOtherNet 247,000us-gaap_PropertyPlantAndEquipmentOtherNet
Deferred tax asset - noncurrent 7,283,000us-gaap_DeferredTaxAssetsNetNoncurrent 7,209,000us-gaap_DeferredTaxAssetsNetNoncurrent
Total assets 37,029,000us-gaap_Assets 39,712,000us-gaap_Assets
Liabilities and Stockholders' Equity    
Accounts payable - trade 455,000us-gaap_AccountsPayableCurrent 367,000us-gaap_AccountsPayableCurrent
Accounts payable - other 159,000us-gaap_AccountsPayableOtherCurrent 327,000us-gaap_AccountsPayableOtherCurrent
Accounts payable - related party 590,000us-gaap_AccountsPayableRelatedPartiesCurrent 412,000us-gaap_AccountsPayableRelatedPartiesCurrent
Accrued liabilities 759,000us-gaap_AccruedLiabilitiesCurrent 444,000us-gaap_AccruedLiabilitiesCurrent
Current maturities of long-term debt 65,000us-gaap_LongTermDebtCurrent 82,000us-gaap_LongTermDebtCurrent
Total current liabilities 2,028,000us-gaap_LiabilitiesCurrent 1,632,000us-gaap_LiabilitiesCurrent
Asset retirement obligation 2,008,000us-gaap_AssetRetirementObligationsNoncurrent 1,780,000us-gaap_AssetRetirementObligationsNoncurrent
Long term debt, less current maturities 824,000us-gaap_LongTermDebtNoncurrent 3,375,000us-gaap_LongTermDebtNoncurrent
Total liabilities 4,860,000us-gaap_Liabilities 6,787,000us-gaap_Liabilities
Commitments and contingencies (Note 9)      
Stockholders' equity    
Common stock, $.001 par value: authorized 100,000,000 Shares; 60,842,413 shares issued and outstanding 61,000us-gaap_CommonStockValue 61,000us-gaap_CommonStockValue
Additional paid in capital 55,703,000us-gaap_AdditionalPaidInCapital 55,671,000us-gaap_AdditionalPaidInCapital
Accumulated deficit (23,595,000)us-gaap_RetainedEarningsAccumulatedDeficit (22,807,000)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 32,169,000us-gaap_StockholdersEquity 32,925,000us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 37,029,000us-gaap_LiabilitiesAndStockholdersEquity $ 39,712,000us-gaap_LiabilitiesAndStockholdersEquity